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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.